Recently a friend asked me about the origins of the Speedmaster design - the case, the bezel, the dial. I gave him an answer that the case was made by Huguenin Freres, but I'm not really 100% sure. The same goes for the bezel. The dial was made by Singer afaik. Also, Rodania Geometer had similar dial layout as Speedmaster, it lacked the bezel though. I tried to research this topic, but couldn't find anything from this forum and neither Google gave me anything. I'd appreciate if more knowledgeable members would give some feedback in this matter.